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8 groups of 2 = 8 groups_of_2 × 2 items/group_of_2 = 16 items → 16 items ÷ 4 items/group_of_4 = 4 groups of 4.
4 groups of 10 = 40. 40 /5 = 8 so the answer is 8 groups of 5.
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She can have 1 group of 40, 2 groups 0f 20, 4 groups of 10, 8 groups of 5, 5 groups of 8 10 groups of 4, 20 groups of 2 or 40 groups of 1. This assumes that you don't want any partial books in any of your groups.
they can be 2 groups of 16, 4 groups of 8, 8 groups of 4, or 16 groups of 2